Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geology Of or pertaining to a
geological epoch , the oldestage or loweststratigraphic stage of theEocene .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From the French ypresien, from Ypres + -ien; equivalent to Ypres + -ian; compare yperite.
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